Question about Bosch AquaStar 2400ES-NG

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Hi there, I have a bosch aquastar 125b waterless tank. My problem is that i am not getting hot water at all. The water runs during the shower and it stays warm. HELP!!

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This should run two showers at once with no problem. If you have a shut off valve on the cold side of the heater, try closing about halfway. This will slow the water flow and the water will have more time to heat up as it pases through the tank. If you dont have a shut off valve, just cut back the hot water valve on your shower and do not use any cold water. If it gets too hot then turn on a little cold water. The object is to slow the speed of the water going through the tank. Tankless heater take a little getting use to but they work great when you know how to treat them. On my shower I turn the hot all the way on until it gets hot and then add a little cold water to bring the temp down. You may have too much water going through too fast to be able to heat it up to what you need. Try this and see how it works.

Posted on Mar 26, 2011

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My pieps froze and now my tankless water tank leaks how do i get a new part



Bosch Aquastar 125B Water Heater Repair Parts Pre January 2003

Bosch Aquastar 125B Repair Parts Selection Grid

This web site has Aquastar 125B parts. It appears your unit was manufactured 7/7/02, so that is what I pulled up for you. At least this will be a start for you to locate the part. I hope these links work.






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Check for crossover.
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http://waterheatertimer.org/Crossover.html

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http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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These type of heaters require a minimum amount of water flow. If your showerhead is the most common flow-restricting type then perhaps it is not permitting the minimum amout of gallons per minute to flow through the unit for it to remain engaged. You might have to try removing the flow restrictor :(

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Try this before replacing the shower diverter valve.

If this problem is isolated to the shower only, then I would suggest that the shower diverter valve is equipped with an "Anti-scald" safety feature that can not be adjusted, however the temperature regulator/thermostat on the water heater can be adjusted to a lower temperature so as to not activate the the "Anti-scald".

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